CBSE Class 11-science Answered
The vertex is the origin and the focus is (-5,0) which lies on the x axis. Since a = -5, it is of the form y2 = -4ax. Hence the equation of the parabola is y2 = -20x.
Alert 1. The negative sign in the equation y2 = -4ax signifies that it is a left handed parabola. Take a as 5 only as the negative sign is aleady considered in the formula.
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